It looks like I will be returning to May's Garden Salon in Roppongi Hills. I gave Nail Quick a shot because it is close to my home. Unfortunately, they mixed up a treatment that I booked on one occasion. On another occasion, they mixed up times. It is not due to a language barrier because I speak Japanese and I HAVE NEVER had difficulty with booking times and treatments at May's (I had been going to this salon for 3 years).
When I gently scolded them for the mix up, several staff members were unprofessional and defensive bordering on rude. No apology was made which is RARE in Japan where the customer is always right.